There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Net work: $2, 400, 0000, 000 US. Patrice Motsepe is South Africaâs richest black man and its wealthiest self made son. Patrice earned his wealth the old fashioned way through hard work, sweat and some luck. His wealth is rapidly increasing, by approximately $1.0 billion just year alone.